itextpdf.jar is a component in iText 5 Java library to provide core functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided at iText GitHub site.

You can compile it to generate your JAR file, using pom.xml as the build configuration file.

The source code of itextpdf-5.5.14.jar is provided below:

⏎ com/itextpdf/text/pdf/parser/SimpleTextExtractionStrategy.java

/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Kevin Day, Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.pdf.parser;


/**
 * A simple text extraction renderer.
 * 
 * This renderer keeps track of the current Y position of each string.  If it detects
 * that the y position has changed, it inserts a line break into the output.  If the
 * PDF renders text in a non-top-to-bottom fashion, this will result in the text not
 * being a true representation of how it appears in the PDF.
 * 
 * This renderer also uses a simple strategy based on the font metrics to determine if
 * a blank space should be inserted into the output.
 * 
 * @since	2.1.5
 */
public class SimpleTextExtractionStrategy implements TextExtractionStrategy {

    private Vector lastStart;
    private Vector lastEnd;
    
    /** used to store the resulting String. */
    private final StringBuffer result = new StringBuffer();;

    /**
     * Creates a new text extraction renderer.
     */
    public SimpleTextExtractionStrategy() {
    }

    /**
     * @since 5.0.1
     */
    public void beginTextBlock() {
    }

    /**
     * @since 5.0.1
     */
    public void endTextBlock() {
    }
    
    /**
     * Returns the result so far.
     * @return	a String with the resulting text.
     */
    public String getResultantText(){
        return result.toString();
    }

    /**
     * Used to actually append text to the text results.  Subclasses can use this to insert
     * text that wouldn't normally be included in text parsing (e.g. result of OCR performed against
     * image content)
     * @param text the text to append to the text results accumulated so far
     */
    protected final void appendTextChunk(CharSequence text){
    	result.append(text);
    }
    
    /**
     * Captures text using a simplified algorithm for inserting hard returns and spaces
     * @param	renderInfo	render info
     */
    public void renderText(TextRenderInfo renderInfo) {
        boolean firstRender = result.length() == 0;
        boolean hardReturn = false;

        LineSegment segment = renderInfo.getBaseline();
        Vector start = segment.getStartPoint();
        Vector end = segment.getEndPoint();
        
        if (!firstRender){
            Vector x0 = start;
            Vector x1 = lastStart;
            Vector x2 = lastEnd;
            
            // see http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html
            float dist = (x2.subtract(x1)).cross((x1.subtract(x0))).lengthSquared() / x2.subtract(x1).lengthSquared();

            float sameLineThreshold = 1f; // we should probably base this on the current font metrics, but 1 pt seems to be sufficient for the time being
            if (dist > sameLineThreshold)
                hardReturn = true;
            
            // Note:  Technically, we should check both the start and end positions, in case the angle of the text changed without any displacement
            // but this sort of thing probably doesn't happen much in reality, so we'll leave it alone for now
        }
        
        if (hardReturn){
            //System.out.println("<< Hard Return >>");
        	appendTextChunk("\n");
        } else if (!firstRender){ 
            if (result.charAt(result.length()-1) != ' ' && renderInfo.getText().length() > 0 && renderInfo.getText().charAt(0) != ' '){ // we only insert a blank space if the trailing character of the previous string wasn't a space, and the leading character of the current string isn't a space
                float spacing = lastEnd.subtract(start).length();
                if (spacing > renderInfo.getSingleSpaceWidth()/2f){
                	appendTextChunk(" ");
                    //System.out.println("Inserting implied space before '" + renderInfo.getText() + "'");
                }
            }
        } else {
            //System.out.println("Displaying first string of content '" + text + "' :: x1 = " + x1);
        }
        
        //System.out.println("[" + renderInfo.getStartPoint() + "]->[" + renderInfo.getEndPoint() + "] " + renderInfo.getText());
        appendTextChunk(renderInfo.getText());

        lastStart = start;
        lastEnd = end;
        
    }

    /**
     * no-op method - this renderer isn't interested in image events
     * @see com.itextpdf.text.pdf.parser.RenderListener#renderImage(com.itextpdf.text.pdf.parser.ImageRenderInfo)
     * @since 5.0.1
     */
    public void renderImage(ImageRenderInfo renderInfo) {
        // do nothing - we aren't tracking images in this renderer
    }


}

⏎ com/itextpdf/text/pdf/parser/SimpleTextExtractionStrategy.java

Or download all of them as a single archive file:

File name: itextpdf-5.5.14-fyi.zip
File size: 2163839 bytes
Release date: 2009-10-09
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⇒ iText-2.1.6.jar - iText, a JAVA-PDF library

⇐ iText layout.jar Source Code

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⇑⇑ iText for PDF Generation